Create New Feature Analysis

This tutorial will guide you to create customized feature analysis for cohort characterization.

Cohort characterization describes the baseline and post-index characteristics of people in a cohort. OHDSI approaches characterization through descriptive statistics of all conditions, drug and device exposures, procedures and other clinical observations that are present in the person’s history. We also summarize the socio-demographics of members of the cohort at the index date. This approach provides a complete summary of the cohort of interest. Importantly, this enables a full exploration of the cohort with an eye towards variation in the data while also allowing for identification of potentially missing values. —Book of OHDSI Chapter 11

Cohort characterization methods can be used for person-level drug utilization studies (DUS) to estimate the prevalence of indications and contraindications amongst users of a given treatment. The dissemination of this cohort characterization is a recommended best practice for observational studies as detailed in the Strengthening the Reporting of Observation Studies in Epidemiology (STROBE) guidelines. (Elm et al. 2008) –Book of OHDSI Chapter 11

1.Click New Feature analyses tab

2.Enter new analysis descriptions

• Change a new name for the analysis
• Add description
• Choose a domain for the analysis
• Click the save icon

3.Choose the design for new analysis

• Prevalence for discrete variables
• Distribution for continuous variables

4.Create design logic

• If the measurement concept is not in a concept set, create a concept set for the measurement you are interested in.
• Add logic restrictions of the design.

5.Create new characterization design

• Click characterizations tab under cohort characterizations section

6.Design your characterizations

• Change the name of the new characterization
• Import cohorts you are interested in
• Import Feature Analyses. You can find standardized default analyses, and the new feature analysis you just created in this step.

7.Excute the cohort characteristics design

• Save the design first.
• Change to executions tab.
• Click “Generate”
• See the cohort characterization result.